bors
85ed056888
Directly implement native exception raise methods in miri This implements the `_Unwind_RaiseException` function used on pretty much every unix system for starting unwinding. This allows removing the miri special case from libpanic_unwind for unix. Windows still needs `miri_start_unwind` as SEH unwinding isn't supported by miri. Unlike DWARF unwinding, SEH preserves all stack frames until right after the do_catch function has executed. Because of this panic_unwind stack allocates the exception object. Miri can't currently model unwinding without destroying stack frames and as such will report a use-after-free of the exception object.
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